He now shares the job with chairman and founder Paul Smith.
Colson joined London-based Celador Films in June 2002 from Miramax, where he was head of U.K. development.
He will remain responsible for commissioning, developing and producing features.
Under his stewardship, Celador Films has completed “Separate Lives,” the directorial debut of scribe Julian Fellowes, and is in post on “The Descent,” Neil Marshall’s follow-up to “Dog Soldiers.” Both pics are slated for U.K. release late in the year.
The reputation of 6-year-old Celador Films was built on the success of its first feature, 2002’s “Dirty Pretty Things,” starring Chiwetel Ejioforand Audrey Tautou. It earned screenwriter Steven Knight (creator of “Who Wants to Be a Millionaire?”) an Oscar nomination.
Colson joined Celador when “Things” was in post.
“Following on from the success of ‘Dirty Pretty Things’ is no small order, and it is thanks to Christian that Celador Films now has two very exciting and very distinct features poised for theatrical release in the U.K. this year,” Smith said.
In November, Smith signaled his intention to step down in June as joint managing director of sister arm Celador Prods. to concentrate on the company’s film and radio activities.